H&R is one of the leading automotive performance spring manufacturer in Europe. H&R was one of the very first companies in Germany to produce high performance lowering springs with TUV approval. Even though U.S. regulations does not require any springs to meet this standard, you will receive the highest quality spring kit that has passed very strict German Government standards regarding quality, fit, and effectiveness. All H&R Springs are progressive rate. This provides the best ride comfort possible while giving superb handling going around tight turns. All springs are designed and tested to U.S. specifications. Every spring is made from the highest quality Belgium-made Bekaert Wire available that is cold wound, heat tempered, shot peened for stress relief, tested, washed, phosphate treated for extra rust protection, and powder coated for long lasting protection and attractive appearance. The results are a high quality spring sets that will not sag, fatigue, or lose their coating. Springs that have been engineered for the enthusiast to deliver the best performance driving feel without sacrificing ride quality.